19. 文件上传下载

19. 文件上传下载

上传

@RequestMapping("/upload")
    public void ss(MultipartFile file){
        File path = null;
        try {
            path = new File(ResourceUtils.getURL("classpath:").getPath());
            File upload = new File(path.getAbsolutePath(),"static/img/");
            if(!upload.exists()){
                upload.mkdirs();
            }
            File fileUp = new File(upload.getAbsolutePath()+ "/"+file.getOriginalFilename());
            file.transferTo(fileUp);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

下载

@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity download(String param) throws IOException {

    // ...

    InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

    return ResponseEntity.ok()
            .headers(headers)
            .contentLength(file.length())
            .contentType(MediaType.APPLICATION_OCTET_STREAM)
            .body(resource);
}